hello, while doing the question please don't put A decimal Answer ( ex: 1.5) because my teacher told me that's incorrect, you can add or subtract depending on the question, or check if you need to simplify! Thank you:)

Notice that the unit segment is divided in 8 parts. Then, each mark is equal to 1/8.
The kitten that weighs the most is placed over the 5ft mark. Then, its weight is:
[tex]\frac{5}{8}[/tex]The kitten that weighs the least is placed over the third mark. Then, its weight is:
[tex]\frac{3}{8}[/tex]Substract 3/8 from 5/8 to find the difference on their weights:
[tex]\frac{5}{8}-\frac{3}{8}[/tex]Since both fractions have the same denominator, we can substract their numerators:
[tex]\frac{5}{8}-\frac{3}{8}=\frac{5-3}{8}=\frac{2}{8}=\frac{2/2}{8/2}=\frac{1}{4}[/tex]Therefore, the difference in pounds between the heaviest and the lightest kittens, is:
[tex]\frac{1}{4}[/tex]